Enhancing the intrinsic properties of flower-like BiOI by S-doping toward excellent photocatalytic performances  

作　　者：Jie Xiong Hong-Yan Zeng Sheng Xu Jin-Feng Peng Fang-Yuan Liu Li-Hui Wang 

机构地区：[1]College of Chemical Engineering,Xiangtan University,Xiangtan 411105,China [2]School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,China

出　　处：《Journal of Materials Science & Technology》2022年第23期190-198,共9页材料科学技术（英文版）

基　　金：supported by Hunan Provincial Innovation Foundation For Postgraduate (No. XDCX2022Y096);Scientific Research Fund of Hunan Provincial Education Department(Nos. 20A480, 20B568);Natural Science Foundation of Hunan Province (Nos. 2020JJ4575 and 2019JJ50613);National Natural Science Foundation of China (Nos. 12002295 and 11832016);Natural Science Foundation of Hunan Province (No. 2019JJ50599)。

摘　　要：A facile strategy was proposed to fabricate the S-doped flower-like BiOI microspheres(S-BiOI) for boosting the photocatalytic performance of BiOI via engineering the surface oxygen vacancy and exposed {001}crystal planes.The S-doping generated oxygen vacancies in BiOI lattice structure to create point defects and exposed {001} crystal planes,resulting in a decrease in bandgap and an enhancement in charges separation,which could significantly hasten the photocatalytic reaction.The concentration of CH_(4) N_(2) S was a key factor to promote the Cr(Ⅵ) reduction activities.The optimized S-BiOI_(1.25) presented a superior Cr(Ⅵ) removal efficiency of 100% for 60 min,which Cr(Ⅵ) reduction rate was 11.3 times higher than the pristine BiOI and still remained 97.5% Cr(Ⅵ) removal after 5 cycles.DFT calculation confirmed that the bandgap of the S-BiOI was narrowed compared to that of BiOI,but the S-BiOI still remained the intrinsic band structure of the pristine BiOI.

关 键 词：BiOI Sulfide doping Oxygen vacancy PHOTOCATALYST Optical absorption 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X505[环境科学与工程—环境工程]